Development and Preliminary Validation of a Brief Depression Scale in a Mexican Sample

Most instruments used to assess depression have been developed in sociocultural contexts that differ substantially from those of Spanish-speaking Latin American populations. To address this limitation, the present study developed and evaluated a new brief measure of depressive symptomatology for use in northeastern Mexico. The study included 414 participants (Mage = 27.37 years, SD = 13.72). An initial pool of 23 items, grounded in interbehavioral psychology, was developed and subsequently evaluated by a panel of 58 expert judges. Based on content-validity analyses, the instrument was reduced to 15 items. Exploratory factor analysis (EFA) and confirmatory factor analysis (CFA) supported a final four-item, one-factor solution. The final model demonstrated adequate fit to the data (χ2/df = 0.281, AGFI = 0.993, NNFI = 1.015, CFI = 1.000, RMSEA = 0.000, 90% CI [0.000, 0.094], and SRMR = 0.008). Evidence of discriminant and convergent validity was supported by a negative correlation with the Subjective Happiness Scale (r = −0.294, p < 0.01) and a positive correlation with the seven-item version of the Center for Epidemiologic Studies Depression Scale (CESD-7; r = 0.273, p < 0.01). Construct reliability was satisfactory (H = 0.841). Overall, the findings provide preliminary evidence supporting the reliability and validity of the proposed instrument as a brief screening measure of depressive symptomatology in a Mexican sample, mostly from Nuevo León.